The last time Woods shot a 61 at any tournament was at the 2005 Buick Open.

Before looking ahead to the PGA Championship, Woods was focusing on finishing the job at the Bridgestone Invitational.

Thunderstorms are expected Saturday.

"We got a long way to go," said Woods. "The golf course will be certainly a lot different than it is now with the weather coming in so we're going to have to make a few adjustments and see how it goes."

British Open winner Phil Mickelson was tied for 43rd. The slumping Rory McIlroy was tied for 25th alongside U.S. Open winner Justin Rose, 14 shots behind Woods.

Park eight shots behind at St. Andrews

At the women's British Open at St. Andrews in Scotland, meanwhile, Inbee Park has work to do if she wants to become the first golfer in 83 years to claim four majors in a single season.